The Pharmacopoeia of the United States of America, was first published in 1820, in both Latin and English. The Pharmacopoeia listed chemicals, metals, plants, and other ingredients for medicinal use. It provided recipes for mixing medicines and became the national standard in pharmaceuticals. The Pharmacopoeia underwent many revisions throughout the nineteenth and twentieth centuries. Today, the United States Pharmacopeia and the National Formulary contain standards for strength, purity, packaging, and labeling of medicines in the United States.